Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Long-established allocation (24y) +6
- Not on any threat blocklist +5
- Has a reverse-DNS (PTR) record +5
- Enterprise allocation +4
- Trust score 85 / 100
Experimental · trust-vectors model v1.2.1 — a transparent heuristic, not a definitive verdict. How it works →
DNS records
- Reverse DNS (PTR)
- gwz-001.iocomp.cz
- Forward-confirmed (FCrDNS)
- Not checked
- PTR TTL
- 300 s
- Reverse DNS last checked
- 2026-10-01 23:53 UTC
- Forward DNS last checked
- 2026-10-01 23:53 UTC
Forward DNS records for gwz-001.iocomp.cz
| Type | Value | Priority | TTL |
|---|---|---|---|
| A | 81.31.32.23 | — | 172800s |
| MX | mail4.iocomp.cz | 1 | — |
| NS | ns.forpsi.cz | — | — |
| NS | ns.forpsi.it | — | — |
| NS | ns.forpsi.net | — | — |
| TXT | google-site-verification=s0uOhh5TBj0OTtSZ7GpNyatdk-uHnO7Y-GOAhnPoCko | — | — |
| TXT | mailconf=https://autoconfig.iocomp.cz/mail/config-v1.1.xml | — | — |
| TXT | v=spf1 ip4:81.31.32.21 ip4:81.31.32.22 ip4:81.31.32.23 ip4:81.31.32.48 ip6:2a01:430:12a:2::2 ip6:2a01:430:12a:2::4 ip6:2a01:430:12a:1::30 ip4:84.42.136.230 -all | — | — |
Reverse & forward DNS collected by the WorldIP scanner fleet — FCrDNS confirms the PTR hostname resolves back to this IP.
Reverse DNS history
How this IP's reverse DNS (PTR) has changed over time, from our scans.
This IP's reverse DNS changes frequently — the timeline below shows the most recent changes.
Reverse-DNS changes between Oct 1, 2026 and Oct 1, 2026 were not recorded; the current PTR is shown from its earliest retained observation.
- gwz-001.iocomp.cz — since at least Oct 1, 2026 → present
- mail.duomoravia.cz — Oct 1, 2026 → Oct 1, 2026
- gwz-001.iocomp.cz — Sep 30, 2026 → Oct 1, 2026
- mail.duomoravia.cz — Sep 29, 2026 → Sep 30, 2026
- mail.ootbsolutions.cz — Sep 28, 2026 → Sep 29, 2026
- gwz-001.iocomp.cz — Sep 27, 2026 → Sep 28, 2026
- mail.duomoravia.cz — Aug 17, 2026 → Sep 27, 2026
- gwz-001.iocomp.cz — Jul 6, 2026 → Aug 17, 2026
- mail.duomoravia.cz — Jul 3, 2026 → Jul 6, 2026
- gwz-001.iocomp.cz — Jun 26, 2026 → Jul 3, 2026
- mail.ootbsolutions.cz — Jun 20, 2026 → Jun 26, 2026
- mail.duomoravia.cz — Jun 19, 2026 → Jun 20, 2026
- gwz-001.iocomp.cz — Jun 14, 2026 → Jun 19, 2026
- mail.ootbsolutions.cz — Jun 13, 2026 → Jun 14, 2026
- mail.duomoravia.cz — Jun 12, 2026 → Jun 13, 2026
- gwz-001.iocomp.cz — Jun 11, 2026 → Jun 12, 2026
- mail.ootbsolutions.cz — Jun 3, 2026 → Jun 11, 2026
- gwz-001.iocomp.cz — Jun 3, 2026 → Jun 3, 2026
- mail.duomoravia.cz — Jun 3, 2026 → Jun 3, 2026
- gwz-001.iocomp.cz — Jun 3, 2026 → Jun 3, 2026
Network Allocation for 81.31.32.51
- CIDR range
- 81.31.32.0/22
- IP range (int)
- 1,360,994,304 — 1,360,995,327
- Prefix length
- /22
- Organization
- MasterDC s.r.o.
- ASN
- AS24971
- ASN name
- MasterDC s.r.o.
- Location
- Czechia
- Coordinates
- 50.084800, 14.411200
- Accuracy radius
- 100 km
- Regional Internet Registry
- RIPE
- Allocated
- 2002-05-28
- Data source(s)
- maxmind_city, maxmind_country, maxmind_asn, ipinfo_lite
- Last updated
- 2026-10-01 08:44:45
BGP Routing
Live BGP anomalies →Origin AS announcing the most-specific prefix that covers this IP, observed across our RIPE RIS collectors.
Frequently Asked Questions
Who owns 81.31.32.51?
81.31.32.51 is allocated to MasterDC s.r.o. (AS24971), registered in Czechia.
Where is 81.31.32.51 located?
The geolocation for 81.31.32.51 maps to Czechia based on MaxMind GeoLite2 data. Accuracy depends on the provider and may represent the ISP's regional hub rather than the exact endpoint.
What network is 81.31.32.51 on?
81.31.32.51 belongs to the 81.31.32.0/22 network block announced by AS24971. This range contains 1,024 addresses.
Does 81.31.32.51 have a reverse DNS record?
Reverse DNS (PTR) records are resolved live when you visit this page. If a PTR record exists, it appears in the Reverse DNS field above. PTR records map IP addresses back to hostnames and are commonly used for email authentication and network diagnostics.
Neighbors
Other addresses in the same /24.
